Bounty hunters have little choice. They can only adapt to changes in project team rules. I think we should set up a bounty project distrust section in the forum, and let it be exposed in this section for projects that have changed the rules many times.
If you have evidence of fraud in any project, you can submit them to a special sections:
https://bitcointalk.org/index.php?board=83.0https://bitcointalk.org/index.php?board=129.0If bounty hunters do not get rewards or something like that, then investors are not very worried. In addition, as a rule, the bounty campaign ends approximately simultaneously with the end of the project ICO. Therefore, changes in the rules at the end will not help many investors.